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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Rio Karma
*
* (c) 2006 Bob Copeland <me@bobcopeland.com>
* (c) 2006 Keith Bennett <keith@mcs.st-and.ac.uk>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include "usb.h"
#include "transport.h"
#include "debug.h"
#include "scsiglue.h"
#define DRV_NAME "ums-karma"
MODULE_DESCRIPTION("Driver for Rio Karma");
MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>, Keith Bennett <keith@mcs.st-and.ac.uk>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(USB_STORAGE);
#define RIO_PREFIX "RIOP\x00"
#define RIO_PREFIX_LEN 5
#define RIO_SEND_LEN 40
#define RIO_RECV_LEN 0x200
#define RIO_ENTER_STORAGE 0x1
#define RIO_LEAVE_STORAGE 0x2
#define RIO_RESET 0xC
struct karma_data {
int in_storage;
char *recv;
};
static int rio_karma_init(struct us_data *us);
/*
* The table of devices
*/
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
vendorName, productName, useProtocol, useTransport, \
initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
.driver_info = (flags) }
static struct usb_device_id karma_usb_ids[] = {
# include "unusual_karma.h"
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, karma_usb_ids);
#undef UNUSUAL_DEV
/*
* The flags table
*/
#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
vendor_name, product_name, use_protocol, use_transport, \
init_function, Flags) \
{ \
.vendorName = vendor_name, \
.productName = product_name, \
.useProtocol = use_protocol, \
.useTransport = use_transport, \
.initFunction = init_function, \
}
static struct us_unusual_dev karma_unusual_dev_list[] = {
# include "unusual_karma.h"
{ } /* Terminating entry */
};
#undef UNUSUAL_DEV
/*
* Send commands to Rio Karma.
*
* For each command we send 40 bytes starting 'RIOP\0' followed by
* the command number and a sequence number, which the device will ack
* with a 512-byte packet with the high four bits set and everything
* else null. Then we send 'RIOP\x80' followed by a zero and the
* sequence number, until byte 5 in the response repeats the sequence
* number.
*/
static int rio_karma_send_command(char cmd, struct us_data *us)
{
int result;
unsigned long timeout;
static unsigned char seq = 1;
struct karma_data *data = (struct karma_data *) us->extra;
usb_stor_dbg(us, "sending command %04x\n", cmd);
memset(us->iobuf, 0, RIO_SEND_LEN);
memcpy(us->iobuf, RIO_PREFIX, RIO_PREFIX_LEN);
us->iobuf[5] = cmd;
us->iobuf[6] = seq;
timeout = jiffies + msecs_to_jiffies(6000);
for (;;) {
result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
us->iobuf, RIO_SEND_LEN, NULL);
if (result != USB_STOR_XFER_GOOD)
goto err;
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
data->recv, RIO_RECV_LEN, NULL);
if (result != USB_STOR_XFER_GOOD)
goto err;
if (data->recv[5] == seq)
break;
if (time_after(jiffies, timeout))
goto err;
us->iobuf[4] = 0x80;
us->iobuf[5] = 0;
msleep(50);
}
seq++;
if (seq == 0)
seq = 1;
usb_stor_dbg(us, "sent command %04x\n", cmd);
return 0;
err:
usb_stor_dbg(us, "command %04x failed\n", cmd);
return USB_STOR_TRANSPORT_FAILED;
}
/*
* Trap START_STOP and READ_10 to leave/re-enter storage mode.
* Everything else is propagated to the normal bulk layer.
*/
static int rio_karma_transport(struct scsi_cmnd *srb, struct us_data *us)
{
int ret;
struct karma_data *data = (struct karma_data *) us->extra;
if (srb->cmnd[0] == READ_10 && !data->in_storage) {
ret = rio_karma_send_command(RIO_ENTER_STORAGE, us);
if (ret)
return ret;
data->in_storage = 1;
return usb_stor_Bulk_transport(srb, us);
} else if (srb->cmnd[0] == START_STOP) {
ret = rio_karma_send_command(RIO_LEAVE_STORAGE, us);
if (ret)
return ret;
data->in_storage = 0;
return rio_karma_send_command(RIO_RESET, us);
}
return usb_stor_Bulk_transport(srb, us);
}
static void rio_karma_destructor(void *extra)
{
struct karma_data *data = (struct karma_data *) extra;
kfree(data->recv);
}
static int rio_karma_init(struct us_data *us)
{
int ret = 0;
struct karma_data *data = kzalloc(sizeof(struct karma_data), GFP_NOIO);
if (!data)
goto out;
data->recv = kmalloc(RIO_RECV_LEN, GFP_NOIO);
if (!data->recv) {
kfree(data);
goto out;
}
us->extra = data;
us->extra_destructor = rio_karma_destructor;
ret = rio_karma_send_command(RIO_ENTER_STORAGE, us);
data->in_storage = (ret == 0);
out:
return ret;
}
static struct scsi_host_template karma_host_template;
static int karma_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct us_data *us;
int result;
result = usb_stor_probe1(&us, intf, id,
(id - karma_usb_ids) + karma_unusual_dev_list,
&karma_host_template);
if (result)
return result;
us->transport_name = "Rio Karma/Bulk";
us->transport = rio_karma_transport;
us->transport_reset = usb_stor_Bulk_reset;
result = usb_stor_probe2(us);
return result;
}
static struct usb_driver karma_driver = {
.name = DRV_NAME,
.probe = karma_probe,
.disconnect = usb_stor_disconnect,
.suspend = usb_stor_suspend,
.resume = usb_stor_resume,
.reset_resume = usb_stor_reset_resume,
.pre_reset = usb_stor_pre_reset,
.post_reset = usb_stor_post_reset,
.id_table = karma_usb_ids,
.soft_unbind = 1,
.no_dynamic_id = 1,
};
module_usb_stor_driver(karma_driver, karma_host_template, DRV_NAME);
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